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It was just under >1" (<1.905 cm) I found this well above the Mean High Tide Line, by a fallen log in the sandy area near the river mouth. It popped right out of the sand in front of me, possibly a burrow? I placed it gently back in the same place after photographing it & it began burrowing back into the sand.
Fun Note:
☆Oregon State University is a public land-grant, research university in Corvallis, Oregon. OSU
https://ir.library.oregonstate.edu/downloads/pk02cf52g
Key to Amphipoda;
Megalorchestia species are on (pages-67-70 in pdf)
☆They have some very good information on many Amphipoda, & descriptive pics of their dorsal & lateral markings and the variations you may see to assist in the identifications of your observations if anyone should be interested. ♡Just sharing it forward.

Photos taken by my colleagues and licensed under CC BY 4.0 when we formally describe this species: http://dx.doi.org/10.3897/phytokeys.156.49137

I know this will be a duplicate of the specimen in GBIF, but I want to add it to the "First Known Photographs of Living Specimens" project.

PS: I've changed the license to avoid a duplicate.